package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.PhoneUtil;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.servlet.http.HttpSession;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        //校验手机号
        if(RegexUtils.isPhoneInvalid(phone)){
            //不符合返回错误
            return Result.fail("手机号格式错误");
        }
        //符合生成验证码并保存到session
        String code = RandomUtil.randomNumbers(6);
        //保存验证码到redis中
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY+phone,code,LOGIN_CODE_TTL, TimeUnit.MINUTES);
        //发送验证码
        log.info("发送短信验证码:{}",code);

        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //校验手机号
        String phone = loginForm.getPhone();
        if(RegexUtils.isPhoneInvalid(phone)){
            //不符合返回错误
            return Result.fail("手机号格式错误");
        }
        //校验验证码
        String cachecode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);

        String code = loginForm.getCode();
        if (cachecode == null || !code.equals(cachecode))
        {
            //不一致，报错
            return Result.fail("验证码错误");
        }
        //一致，根据手机号查询用户
        User user = query().eq("phone", loginForm.getPhone()).one();
        //判断用户是否存在
        if (user == null){
            //不存在创建用户
            user = createUserWithPhone(loginForm.getPhone());
        }
        //随机生成token
        String token = UUID.randomUUID().toString(true);
        //将user对象转为hash存储
        UserDTO userDTO = new UserDTO();
        BeanUtil.copyProperties(user,userDTO);

        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName,fieldValue)->fieldValue.toString()));
        //保存用户信息到redis
        stringRedisTemplate.opsForHash().putAll(LOGIN_USER_KEY+token,userMap);
        stringRedisTemplate.expire(LOGIN_USER_KEY+token,LOGIN_USER_TTL,TimeUnit.MINUTES);
        //返回token
        return Result.ok(token);
    }

    private User createUserWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX+RandomUtil.randomString(8));
        save(user);
        return user;
    }
}
